fix: T16 verification cleanups

- golangci-lint: errcheck on resp.Body.Close in Lidarr client + revive
  unused-parameter in delete_test.go
- coverage: 2 error-branch tests added to lidarrquarantine.Service
  (DeleteFile + DeleteViaLidarr track-not-found paths) bring per-package
  coverage to 81.4% (target >=80%)
- search/tracks.test.ts: same TrackMenu name-collision fix T13 applied to
  TrackRow.test.ts — exact-string button match instead of regex

internal/lidarr/delete_test.go

@@ -203,7 +203,7 @@ func TestDeleteAlbum_NetworkErrorReturnsErrUnreachable(t *testing.T) {
 }
 
 func TestDeleteAlbum_ZeroIDRejected(t *testing.T) {
-	c, srv := newTestClient(func(w http.ResponseWriter, _ *http.Request) {
+	c, srv := newTestClient(func(_ http.ResponseWriter, _ *http.Request) {
 		t.Error("server should not be called with zero id")
 	})
 	defer srv.Close()